checkbox ng-model value is true code example
Example: ng-true-value
<input type="checkbox"
ng-model="string"
[name="string"]
[ng-true-value="expression"]
[ng-false-value="expression"]
[ng-change="string"]>
<input type="checkbox"
ng-model="string"
[name="string"]
[ng-true-value="expression"]
[ng-false-value="expression"]
[ng-change="string"]>